Didn't the Ultrafear have a different composition baseplate from the Contact? I seem to remember reading somewhere they did a carbon composite injected polymer rather than the fiberglass like in the normal Contact. Either way, you'll pay a premium over the normal Contact.

The Ultrafear was $90 over the Horrorscope as it was, to do an Ultrafear+Ultrafear over a Horrorscope+Contact setup, I would guess you might pay anywhere from $110-$140 more.